Go over to the Parenting with Special Needs forum. Search for vaccination and autism. There are several threads that I can think of, and probably more since I stopped following it that closely, where someone came in and said "Oh, apparently no one knows any unvaccinated kids with autism!" and then parents in that forum start posting that actually, yes, here's one, and here's another, and here's another....
I am trying not to go against the rule against bringing old threads to discuss in other forums, but the idea that if you're unvaccinated you can't be autistic is demonstrably false, even using MDC families.
This is a very large thread. I can think of one poster who links vaccines strongly with autism (but even she discusses the mercury and heavy metals in other things) and numerous people who do not rule out environmental issues in the rate of autism.
I think vaccines might be linked to autism in some way for some people.
Yes, unvaccinated people can be autistic. I wonder if their rates are lower, though. As the totally unvaccinated population is quite small it would be hard to determine.